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Sorry to say, but that P0700 code is what we refer to as the "death code" for that transmission. If you plan on keeping the truck, I'd go with a Jasper reman. Can't beat the warranty--3yr\100k and it's honored nation wide. Just my .02

I don't know anything about the half ton transmissions but I have a duramax with the allison trans. My Trans Control Module went out causing it to be stuck in 3rd gear and shifting really hard from neutral to reverse or forward but it could cause many different issues. Hopefully it is just a controller and not the whole transmission. Just find a good transmission shop to do your work.

Sorry to say, but that P0700 code is what we refer to as the "death code" for that transmission. If you plan on keeping the truck, I'd go with a Jasper reman. Can't beat the warranty--3yr\100k and it's honored nation wide. Just my .02

I don't know anything about the half ton transmissions but I have a duramax with the allison trans. My Trans Control Module went out causing it to be stuck in 3rd gear and shifting really hard from neutral to reverse or forward but it could cause many different issues. Hopefully it is just a controller and not the whole transmission. Just find a good transmission shop to do your work.

It is down shifting hard btw 2-1. Sometimes also lags to shift btw 2-3 gear sometime.

my 2001 is at the transmission place now. it has a 4L60E or somethin like that. after 269K miles and zero problems.... third and fourth gear has gone out.
the trans guy said 1700-1900 for a rebuild job.